Burglar-alarm.



G. F. LUMB.

BURGLAR ALARM.

APPLICATION FILED AUG.16. 191s.

1,21 3,389. Patented Jan. 23, 1917.

WM A MW M GEORGE F. LUMIB, 0F HARRISBURG, PENNSYLVANIA;

BURGLAR-ALARM.

Specification of Letters Patent.

Patented Jan. 23, 1917.

Application filed August 16, 1916. Serial No. 115,321.

To all whom it may concern:

Be it known that I, GEORGE F. LUMB, a citizen of the United States, residing at Harrisburg, in the county of Dauphin and State of Pennsylvania, have invented certain new and useful Improvements in Burglar-Alarms, of which the following is a specification.

My invention relates to burglar alarms.

The object of my invention is to produce an alarm bell attached to the sash of a window and adapted to be shifted into and out of frictional contact with the adjacent window frame by which the alarm is adjust into and out of operative position, and a further object of my invention is to produce a more simple, cheap and efficient device of the character described than has heretofore been attained.

To these ends my invention includes the combination and arrangement of component parts to be hereinafter described and more particularly pointed out in the claim.

In the accompanying drawings, in which like reference characters "indicate similar parts, Figure 1 is a perspective view of my invention in operative position. Fig. 2 is a similar view in inoperative position, and Fig. 3 is a vertical sectional view.

Referring now to the drawings, 1 indicates a plate adapted to be secured to the frame of a window sash adjacent to the edge thereof by the screws 2. At the upper end of said plate is provided an outwardly extending .projection 3 having a rounded edge over which the spring arm or shank 5; is adapted to ride in shifting my alarm into its different positions.

The hell 6 is carried on the opposite end of the plate 4E from the shank 5, which plate 4, as shown, is pivoted on the plate 1 intermediate of its ends. Said bell comprises the substantially semi-cylindrical base section 7 attached to the pivoted plate 4 by the post 8, the outer end of which is screw-threaded at 9 to which the outer or upper section 10 is removably secured. Loosely mounted on said post is carried the hub 11 having the ratchet wheel 12 at its lower end, and the radially extending arms 13 on the outer ends of which are loosely carried the strikers 14.

Offset from the center of the base section 7 is mounted the ratchet wheel 15, on the Copies of this potent may be obtained for post 15, which engages the ratchet wheel 12 and projects through the opening 16 in the side of the base section to engage the edge of the window frame when shifted into contact therewith.

In use, the bell of my invention may be carried on the sash of a window in dormant and inoperative position as shown in Fig. 2 of the drawings, but may be shifted by throwing the lever or shank 5 over the projection 3, whereby the ratchet or friction wheel 15 is contacted with the side of the WlIlClOW frame. In such position, the raising or lowering of the sash will revolve the wheel and actuate the strikers 1a, and thus sound an alarm.

It will be appreciated that my invention will permit the bell to be conveniently and positively shifted into operative and inoperative positions as desired, and that my device not being dependent on a spiral spring is more durable than any other device known to me.

Having thus described my invention, what I claim as new and desire to be secured by Letters Patent, is:

A plate adapted to be secured to a window sash, having an upturned outwardly extending projection at one end thereof, a plate pivotally mounted on said first-mentioned plate intermediate of its ends, a spring arm on one end of said second-men tioned plate by which said plate may be shifted on its pivot and adapted to engage the upturned projection on the first-mentioned plate to hold same in adjusted positions, an alarm bell carried on the opposite end of said pivoted plate having a friction wheel projecting from the side thereof adapted to engage the side of a window frame when adjusted into operative position and held therein by the spring action of said arm, and ratchet means within said bell and in operative engagement with said friction wheel for actuating the striker mechanism of said bell, substantially as described.

In testimony whereof-I hereby aflix my signature in the presence of two witnesses.

GEORGE F. LUMB.

Witnesses:

WM. H. EARNEST, MARK T. MILNOR.

five cents each, by addressing the Commissioner of l'atents, Washington, D. 0., 

